60 BULLETIN OF THE NUTTALL 



Troglodytidge. 



2. Thryomanes Lrevicaiula. Tliiyoiiiaiies bewicki. 



3. Salpiiictes guadalupeusis. Salpinctes obsoletus. 



Fringillidae. 



4. Carpodacus amplus. Carpodaciis frontalis. 



5. Jimco insiilaris. Junco annecteiis. 



6. Pipilo consobrinus. Pipilo iiiaculatus. 



Picidae. / 



7. Colapjtes rufipileus. Colaptes luexicanus. 



Falconidae. 



8. Poly boms lutosus. Polyborus tharus.* 



The more prominent characteristics of these Guadalupe birds, as 

 compared with the mainland forms, are (1) increased size of the 

 bill and feet, (2) shorter wings and tail, and (3) darker colors ; 

 these variations are by no means uniform, however, in the several 

 species, the differentiation being in some slight, while in others it 

 amounts to ahnost generic distinctness ; but, what is very remark- 

 able, and of great interest in connection with the subject in hand 

 is, that no matter how great may be the modification of form and 

 proportions, the specific characters, so far as coloration is concerned, 

 are in every case strictly preserved ! t Thus, Carpodaciis ampins has 

 the wing and tail barely longer than C. frontalis, but the bill is 

 three times as large, and the feet twice as stout, while the colors and 

 marhings are substantially identical ; Junco insularis has precisely 

 the same plumage as J. annectens (except that the shades of color 

 are just perceptibly darker), but the bill is so elongated, and the 

 wings and tail so much abbi-eviated, that in form it is much more 

 like the species of Ammodromus than those of typical Junco ! Thry- 

 omanes brevicauda does not differ more than just appreciably in 

 colors and marking from 7\ beivicki, but the difference in form is so 

 great as to render it necessary either to institute a new genus, or, 

 as the only alternative, to draw up a generic diagnosis entirely 



* Singularly enough, the Pohjhorus from Guadalupe resembles much more 

 closely tlie South American species than that from Mexico (P. chcriway), 

 though it is very distinct from either. 



The only water-bird collected on the island was a specimen of Cohjmbus pa- 

 cificus, in perfect breeding plumage, found dead on the sJiorc. 



t With the sole exception of Polyborus lutosus. 



